J & J
Racing, Ltd. has been repairing cast magnesium and
aluminum parts for the motorsports community for over 25
years.

Magnesium
&
Aluminum
Casting Repairs

"All the repair work is done in house"

Whether it's an upright / hub carrier, adapter housing /
plate, gearbox case, etc. chances are we can repair it for
you. All the repair work is done in house. From initial zyglo
inspection to weld repairs and on through finish machining,
our staff does it all under our roof. This way we are able to
control quality and scheduling from start to finish.

A short walk through of the repair process includes:

1) Cleaning - The damaged part is cleaned in a high
pressure hot tank to remove contaminants on the surface, as
well as inside the cracked / broken area.

2) Initial zyglo inspection - This is a process used in
the aircraft and motorsports industry to detect cracks in non
ferrous metals. The broken part is put in a wet bath of Magna
Flux brand test fluid. The purpose of this is to invade the
cracked area with a fluorescent dye. The part is then
thoroughly cleaned and a developer solution is applied. Once
dry, the part goes to the Magna Flux booth to be viewed under
a special ultra violet light. This can show additional cracks
found in areas surrounding the damage site, as well as other
areas of the casting.

3) Evaluation - The part is evaluated to see if it is
repairable. Many factors enter into the decision making.
Obviously the extent of visual damage is a factor, but
location of the damage, extent of deformation of unbroken
material and labor required for welding and machining is all
factored in. We will then provide an estimate of repairs
before going further. Not all castings are repairable. We will
advise you if your part is not repairable.

4) Weld repairs - We remove any damaged material as
needed. Determine what type of inert gas shield / purging
system should be used for the particular repair. The casting
is then pre heated and welded. After the weld repair is
completed, the casting goes through a controlled cool down.

5) Finish machining - After the broken part has been
welded, we set up the part in a fixture on a milling
machine. We have Bridgeport milling machines with digital
read out computer measuring systems which measure to the
tenth of a thousandth of an inch on all four axis's for
extreme accuracy.
We locate any pick up points or bolt circles which have been
repaired and machine as needed. We have blueprints for
many parts from popular cars such as Swift, Ralt, Lola,
Crossle, March, Van Diemen etc. also Hewland and Staffs
transmission cases.

In the event that we do not have a blueprint of the part
you need repaired, we may ask you for a sample part, for
instance an upright from the undamaged side of your car.
If sample parts are not available we will reverse engineer
to get the dimensions we need.

6) Final Inspection - After all phases of the repair
are completed, the part goes back to Zyglo inspection to
detect any possible flaws in the repair.

Casting repairs are billed on a time and material basis. As
is mentioned above, we would be glad to quote your specific
repair needs. Contact us for more
information.